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What does it mean when an ATV56 display shows the image of a keypad and a drive with a line between the two and an ``X`` across the line?

This indicates a link fault or keypad link fault (not to be confused with a serial communication link fault). This means communication between the keypad and the control board has been interupted. It may be the keypad is mis-seated, there is a loose keypad cable (if applicable), the control board of keypad has malfunctioned, or there is a power board issue. Each of these should be checked in turn to isolate.